| Sonderborg to Opwijk | 358.83 mi (577.48 km) |
| Sonderborg to Ostend | 382.23 mi (615.14 km) |
| Sonderborg to Oud-Heverlee | 353.60 mi (569.07 km) |
| Sonderborg to Oud-Turnhout | 318.50 mi (512.58 km) |
| Sonderborg to Oudenaarde | 381.16 mi (613.41 km) |
| Sonderborg to Oudenburg | 381.82 mi (614.48 km) |
| Sonderborg to Oupeye | 338.18 mi (544.25 km) |
| Sonderborg to Overijse | 359.79 mi (579.03 km) |
| Sonderborg to Overpelt | 313.32 mi (504.25 km) |
| Sonderborg to Paal | 329.40 mi (530.11 km) |
| Sonderborg to Peer | 317.29 mi (510.63 km) |
| Sonderborg to Pepinster | 343.19 mi (552.31 km) |
| Sonderborg to Peruwelz | 399.49 mi (642.91 km) |
| Sonderborg to Perwez | 361.93 mi (582.47 km) |
| Sonderborg to Philippeville | 392.91 mi (632.33 km) |
